Electric stop for engines.



'No. 872,102. PATENTED NOV. 26, 1907. J. K. WRIGHT.

ELECTRIC STOP FOR ENGINES. APPLICATION FILED ran. 4, 1907'.

3 SHEETS-SHBET 1.

fr: vac Z07 PATENTED NOV. 26, 1907.

J. K. WRIGHT. ELECTRIC STOP FOR ENGINES.

APPLIGATION FILED T113. 4, 1907..

3 SHEETS-SHEET 2.

PATENTED NOV. 2 1907.

J. K. WRIGHT.

ELECTRIC STOP FORYENGINBS.

APPLICATION FILED FEB. 4, 1907.

3 SHEETS-SHEET 3.

has [Zn 1W 37 M order and become gizedelectromagnet; th

runs 1;. WRIGHT, OF NEW YoRK, N. Y. nm'c'mrc s'ror roa axioms.

Specification of Letters Patent.

Patented Nov. 26, 1907.

Application filed new, 4.1007. sol-a1 No. 366.596.

To all whom it may concern:

Be it known that I, citizen of the United States, residi York, N. Y., have invented certain in New prove- I ments in Electric Stops for Engines, of which the followi' is'a specification.

My invention relates to that class of engine governing mechanism, whereby a valve is caused to pperate to cut oil the steam supplied to an engine whenever the speed of the atter varies in either direction beyond predetermined limits; the main object of-theinventlon being to rovide an assemblage of apparatus which s all be certain in its action and of such a nature that it cannot get 'outof shutting down the engine.

I further desire to provide apparatus of the general class above noted in which a valve in t e main steam line engine. close it an supplying the provided with means tending to controlled by a normally enerere being in circuit with said magneta switch or switches designed to be opened by the e e whenever its speed exceeds or falls be ow predetermined limits.

I also desire to provide such a paratus as that indicated,'with means whereby it-is prevented from acting when the engine is bei shut down under normal'conditions, and also with means whereby it is automatically reset, ready for action.

These objects I attain as hereinafter set forth, reference being bad to the accompanying drawings, in which Figure 1, is a perspective view, to some extent diagrammatic, illustrating my invention as applied to ane ine and the steam pipe supplying the same 2, is a side elevation, partly in section, il ustrating'the switch mechanism and apparatus for operating the same under predetermined conditions of s eed variation; Fig. 3, is an end elevation of the device shown in Fig. 2; Fig. 4, is 0. Ian of one end of the device illustrated in ig'. 2; Fi 5, is an end elevation of the main steam valve, illustrating the device for automaticcontrolling are respecally operating the same and the magnet therefor; Figs. 6 and 7,

tively'an end elevation and a lan of the apparat'us shown in Fig. 5, and i 8, is a diagrammatic view illustrating] t e electrical connections of the various parts of the appa to above drawings, A repreuntrustworthy without of operation, be

-18 a plunger J carried by the sents the steam pipe connecting a boiler B to Jauns K. WRIGHT, a J an engine C; there being in said pipe a main steam valve D designed to be automatically operated whenever the speed of the engine varies above or below predetermined limits.

A casing E, which contains the apparatus illustrated in Figs. 2 to 4 inclusive, is rovided, and a pul ey e, carried on'a spin le 0 projecti v from-said casing, is belted to the main sha t of the engine.

Referri to Figs. 2 to 4 inclusive, it will be seen that there is within the casing E a standard e, ing-provides suitable supporting bearings for the spindle e, and on' this latter are mounted two collarsf and f, of which the latter is immovably fixed in sition, while the former is free to slide Said collar is however, compelled to turn with the spindle, by reason of the fact that itis connected to the fixed collarf' by springs which at their mid-points carry governor alls in the manner common in centri al overnors. Slidably mounted upon the spine ei so as to f Liar-eject bfriayond the fitandard e lsaseeve a e ,a connecte tothe slidz ible cbll agrf mg f I Mounted on an arm 0' of the standard e is a switch structure G inclu a sprin contact piece 9 and a screw f with whic said spring is normall in circuit and these two parts are mounted on the bar 9' in such manner as to be insulated from one another.

The contact 9 is so placed that the end of 90 undeg' gertfiin condition? 0 e t eflangef o the sleeve f Aleib iifimnt d within the easing E is a bar or lever H pivotally mounted atone end so as to extend ad'acent to the endf' of the sleeve f. A fixe bar I is also mounted in the casing so as to extend substantially parallel With'the lever H when this is in its normal position, and said bar has at one end an adjustable screw 5 projecting toward the lever H and also carries a spring '1', tending to from 1t toward the spindle e.

the sp 9 may,

Further, there bar I so as to ject toward and. partially through the ever H, which plunger is normally maintained in a definite position by means of a s confinedbetween a fl e or collar 531%? bar I heAn electricsilgch structure I; is fixed to t casing" an a s arm project' adjacent to the end oi ul which with the end of said 085- ongitudinallv. 4

press said lever away 7 plunger J. This mounted tri spring arm is so constructed that it normally engages a contact piece k, which with the spring 7c, is provided with terminals for the' 'a-tt ac-hment of conducting Wire's.v The spring whereby its coke in'whichiit is heldby the trigger h.

of said trigger opposite'to that having the hook projects so as to be engaged'by; the

screw trwhen'thelever has been moved a pre determined distance away from the spindle cl It will be noted that the bolt is so proportioned that when it is engaged by the trigger h the lever H may beengaged by the end f 6 of the sleeve f 4 and turned on itspivot against the action of the'spring i,-w\-'ithout causing movement ofi'the plunger Jfwhile, on theother hand, if the bolt is. in its red leased position, it may either rest upon the 'plung'er .if this latter projected as shown in Fig. 2or it, may rest in front of'the plunger. Referring now to- Figs. 5 6-and 7, the

valve structure D- has Within it a "pivoted valve d, shown in dotted lines in'Fig. 5, and

' in full lines. in Fig. -6, provided with a spindle d, which rojectsfo'ut'side of the va1ve.cas-.

ing. 'To t is spindle is fixed an arm or segment (1 having attached to its lower enda weightd and also having mounted onit apin (1 A bell crank lever'M is pivotally mounted on the valve casing and one ,of'its arms is notched so as to'engagethe pind and maintain the arm orseglrnentd so that it projects in a substantially "orizontal direction in spite of the weight (1 which tends toi move it downwardly through anarc of about;

90. The valve d is so mounted upon the spindle that while'it is open, the arm or segment (1 is in the horizontal and will be closedwhen sai armis moved by the weight to its lower osition.

Thesecond arm of the ell, crank lever M serves as an armature for amagnetP and. is so proportioned that so long as the magnet.

is energized it maintains the secondarmof the lever in ei'igagement with the pin d;

so designed as to cause the lever M as a whole to swing on. its pivot andrelease thepin d and hence the'arm d.

The magnet the two switches K and G, there beingalso included inthe same circuit any suitable source ofcurrent, such as a battery When the engine is ocrating under normal conditions,.-as to spec the spindle e is turned (position 'shown,-

If] hon ever, it is rcleasedlby the. magnet, it is! P is connectedin series Withand the "governor ballsf? move out to such the end xg 'of t e contact spring g. It now,

,exce'ssiv'e} outward movement et the vgovf 5 to" engage the, end 9 of the contact spring .er gizingthe-lattera As a resultfthe arma- [ture' arm of the lever M falls by gravity and 9.. ;'As aresult this sprin'g'is moved away from its contact. pieceig and caused to break thejcircuit of the magnet 1 thereby de'ena position thatthesleevefand the collar f 5 occupy positions somewhere between that shown, and'a oslt-ion, in engagement with the speed of the"-engine,. for any reason increases beyond a predetermined point, they ernor 'ballsj" will cause'the flange-or collar;

moves on its" pivot thereby disen agnig the 1,)? pin d so that the arm or segment 2 is free to turn the'valvespindle cl" under the action .of

the weight (1 so as to immediately the flow of steam to'the engine.

cutoff The bolt L under normal conditions is maintainedwith its body portion in front of 5 the plunger K, so that it the driving belt con- ,necting the pulley c with the engine should" I ;break or if'for any abnormal-cause the engine :"sho'uld slow down below a predetermined point, the end f of the slccvef" would'occupy the position shown in. Fig. 2, and the plu ger J would be moved against the action 0 .its spring into engagementwith the contact spring of the switch K. :This would, therefore, be moved out of contact with the piece k so that, as before, the circuit of the magnet F would be broken and the weight d freed to close the valve (1,. i

' It willjbe understood that under ordinary days run, and forfthe-purpose of preventing devicein condition to automatically assume its protective function when the engine is subsequently started, I have'devised the-particular arrangement shown in Figs. 2 and 4. Jus't beforethe engine isstopped, the bolt L ispulled outwardly by hand until its notchl ,is' engaged by the hooked end of the trigger it, whenit is held in such" outer position by this'de viceif When the engineslowsdown and the end f of thesleeve f turns the lever Hon its pivot, the end of the plungery' enters the space normally occupied by the end of the bolt L and'thereafter the trigger h comes thereby turned on its ivot and made to 're-' lease the bolt L,' Whic 1, under the action of its spring l', is moved soas t'o'rest u .on theend of the plunger. Consequent y, the

plunger J is not mov'ed outwardly-and there is no breakage ol'the circuit of the magnet P,

If now, the engine be again started and the governor balls thereby caused to move outwardly, the sleeveffis' moved away from the in contact with the screw 'i. v Said trigger is even though the engine comes to a full stop.;

conditions it would be undesirable for this valve-to be automatically closed every time 5 the engine was shut down at the end of a v thisand yet at the same time maintaining the weight constantly tending to close said placed to act the valve, a bell crank lever having one of its arms constructed to magnet, with speed responsive-means 0 rlever H, which is made to follow it by the spring 'i. This movement of the lever causes the bolt L to be gradually moved away from the lunger J, so that the body of said bolt is iina ly drawn down in front of the end of the said plunger, thereby again making the device ready for operation in event of an objectionable variation in the engine speed.

I claim:

1. Safety stop mechanism for an engine including a normally closed switch, means for automa'ticall opening the same whenever the s ed 0 theengine passes a redetermined imit, a normally energized e ectromagnet in circuit with the said switch, a valve in the main steam line of the engine, a

valve, a device for normally preventing such closure, said device including a lever having an arm normally attracted to the magnet, substantiallyasdescribed.

2. Safety stop mechanism for an engine, including a valve in the .main steam line, a spindle for the valve, a'weight'operative on the spindle and constantly tending to close maintain the weight; position an electromagnet on the dther arm of thebell crank lei, r, a source of current, and a nor mally closed switch in circuit with the said in a raised ated by the en 'no for operating the switch under abnorm fi speed conditions, substan-' tially as described. 1

engineinsgindle driven frorntheably mounted on said speed responsive, means driven spindle and operative upon the Y two normally closed switches, of

sp ndle from the member,

speed falls which one is placed to be opened when said member is moved to an abnormal extent in one direction, and the other is placed to be opened w en said member moves to an abnormal exlent in the opposite direction, with means including a normally energized magnet in circuit with the switches for cutting off the su ply of steam to the engine when either 0? said, switches is operated,

substantially as described.

4. Safety stopmechanism for an'engine ineluding an electric switch, means in circuit with said switch for causing cutting off of the steam supply to the engine when said switch is operated, and means actuated by, the engine for operating said switch under abnormal conditions of speed, said latter means including a plunger, appivoted lever, a bolt carried by the lever .and-movable into' or out of a position of engagement with the plunger, means for holdi the bolt out of said position, andn eans' orcausing automatic release of said bolt'under redetermined conditions,'-eubstantially as ascribed eluding anclectri'c's witch," means in circuit with said switch for controlling the cutting 5. Safety stop for an engine in ofi .of'steamto the engine, a device for auto-1 matica'lly opening the below .a' predetermined I int, means'for preventing action of said evice when theengme is' shut down,- with mechan ism for resetting said'device, substantially as.

described. v Injestimony whereofgl have signed my twosubscribingwi v I 'f JAMES K. WRIGHT.

.Witni "1; 'D. D. Lovans'cn, Y

A. C. Hn'rnannm.

switch when the engine lb on, in the presence of 

